I haven't posted yet in your thread, but I've been lurking, and just had to chime in to say that I love your setup. I grew up in FL swimming in seagrass beds and mangrove forests around Miami and the keys, and your tank is the closest thing I've seen yet to my memories.
I've always dreamed of doing something like this but haven't had the time, resources, or space to ever do it, but I'm glad to see that someone has done it and has such a beautiful example of it.
I like the ideas of the dwarf angel harem (I love paired/grouped fishes), and I wouldn't expect you to see them make much of a dent in the macro algaes. Since you have the DSB you could always look into pearly headed jawfishes as well, a fun Caribbean species.
Such a nice setup for something totally different than most people are going for. Thanks for sharing!